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Originally Posted by tomp
Your thermostat is ultimately going to determine the temps.
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As Paragon said - not really.
The thermostat will open roughly at a pre-set temp, but once it's open, it stays open. And once it's open, if the heat continues to go up, the thermostats have nothing to do with it.
So - if the thermostat is set for 180 degrees, they will open and stay open, even if the coolant is boiling out and it's at 280 degrees.
Also - Messing with the thermostats is not something that is recommended in today's strange emission controlled vehicles.
The vehicle has to get up to the optimium operating temp in as fast as possible to reduce greenhouse gases. The thermostats are designed to help with that.
The issue really at hand is how well the vehicle cooling system transfers heat away from the coolant to the open air. I have some doubts about that in an arid desert environment combined with the H3 design.